Grand-Unification Scale Generation through the Anomalous U(1) Breaking

Details Grand-Unification Scale Generation through the Anomalous U(1) Breaking Grand-Unification Scale Generation through the Anomalous U(1) Breaking

1999-04-12

arxiv.org/abs/hep-ph/9904303v2

Phys.Rev.D60:115016,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, Latex, references added

Scientific paper

10.1103/PhysRevD.60.115016

We discuss the anomalous U(1) gauge symmetry as a mechanism of generating the grand-unification scale. We conclude that unification to a simple group cannot be realized unless some parameters are ``tuned'', and that models with product gauge groups are preferred. We consider the ``R-invariant natural unification'' model with gauge groups SU(5)_{GUT} \times U(3)_H. In this model the doublet-triplet splitting problem is solved and the unwanted GUT relation m_s = m_\mu is avoided maintaining m_b = m_\tau. Moreover, R-invariance suppresses the dangerous proton decays induced by dimension four and five operators.

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